Fast food isn't off-limits on keto — you just have to know which three moves to make. At a burger chain: order it bunless or lettuce-wrapped, add cheese and bacon, skip the fries, soda, and shake. At a fried chicken chain: get grilled chicken if it's offered, or peel the breading off; skip the biscuits, fries, and soda. At a sub or sandwich chain: order it as a salad or protein bowl instead of on bread; skip the chips and cookies.
Every one of these chains already has a keto-compatible way to order, because "protein without the starch" is a request restaurants get constantly now — you're rarely inventing something the kitchen has never heard. The reason fast food gets a bad reputation on keto isn't the meat, it's the bread, the batter, and the sides that come with it by default. Once you name those three (bun, breading, bread) and swap or skip them, most of a fast food menu is actually workable.
A few chain-specific notes worth knowing:
The soda and shake matter more than people expect — a regular soda or shake at any of these chains can carry more sugar than the rest of the meal combined, so that's often the single highest-leverage thing to swap for water or a diet drink.
Burger chains: ordering "protein style" or lettuce-wrapped but keeping the special sauce, which can carry a fair amount of added sugar even without a bun in sight. Ketchup and some barbecue sauces are the other quiet source — mustard and mayo are usually the safer default.
Fried chicken chains: grabbing a "combo" out of habit, which usually bundles in fries and a biscuit whether you meant to order them or not. Ordering the chicken on its own, or as part of a salad if the chain offers one, sidesteps the sides you didn't actually want.
Sub and sandwich chains: getting the bowl version right but then adding a sweet dressing or a heavy honey-mustard sauce that undoes the point of skipping the bread. Oil and vinegar, ranch, or a simple vinaigrette are the safer picks — the "signature" sweet sauces are usually where the carbs hide.
Across all three categories, the pattern is the same: the entrée itself is rarely the problem on a fast food order — it's the bun, the batter, the default side, and the sauce that get added on top of it without anyone re-deciding whether they belong there.
Burger, fried chicken, and sub chains are three of the fast-and-casual situations built into the app, alongside pizza, cafes, bars, and buffets — so the "what do I actually order here" question is answered before you're standing at the counter.
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